Pressure-variation adsorption separation recovering method for mixd gas containing chloroethylene and acetylene

Abstract

This invention relates to variable voltage absorbing separating recovery method of vinyl chloride and acetylene mixed gas. Each absorbing tower through the variable absorbing cycle process of absorbing, inverse disperse, evacuation and final boosting procedures is done. The mixed gas is processed at least two variable voltage absorbing unit, discharged gas processed by front unit in turn entering next nearby absorbing unit to get vinyl chloride and acetylene product gas. at least two absorbing tower are contained in each variable voltage absorbing unit, absorbing agent in the first tower at least contains alumina, at least one of average aperture 1-3mm silica gel or molecular sieve is contained in last variable voltage absorbing unit. This method is propitious to process mixed gas that contain more C2H3Cl and C2H2, it can make C2H3Cl and C2H2 concentrate 2-200 times, and make C2H3Cl and C2H2 be separately separated, recovered and used by the mixed gas. C2H3Cl and C2H2 in detergent effluent gas can reach environmental protection request.

Description

technical field [0001] The invention relates to a gas treatment method in the form of pressure swing adsorption, specifically a pressure swing adsorption treatment method for separately separating and recovering the mixed gas containing vinyl chloride and acetylene. Background technique [0002] Vinyl chloride (C 2 h 3 Cl) is a monomer for synthesizing polyvinyl chloride (PVC) resin. In the production of calcium carbide method, due to the low purity of feed gas and some unreacted acetylene (C 2 h 2 ) exists and other reasons, so that C 2 h 3 In the process of pressurized rectification, the non-condensable gas is continuously evacuated from the system at constant pressure, which is usually called rectification tail gas. The approximate composition of the gas is shown in Table 1. Direct discharge of tail gas without purification treatment will not only seriously pollute the environment, but also cause a large amount of C 2 h 3 Cl and C 2 h 2 Waste of resources. With...

AI Technical Summary

Problems solved by technology

Although put in the air C 2 h 3 The content of Cl has reached the national environmental protection emission requirements, but C 2 h 3 The recovery rate of Cl is not ideal enough, and the C 2 h 3 Cl and C 2 h 2 They are all recycled, and it is not clear that they are released into the air. C 2 h 2 Whether the content of the content meets the requirements of environmental protection at the same time

[0009] In addition, although the above-mentioned various one-stage PSA methods can treat C in the mixed gas 2 h 3 Cl and C 2 h 2 Carry out recovery treatment, the C in the purified gas after treatment 2 h 3 Cl and / or C 2 h 2 It can also meet the national emission standards, but because the characteristics and potential of this technology have not been fully utilized, the C in the product gas 2 h 3 Cl and / or C 2 h 2 The concentration is not high, it is easy to bring more non-condensable gases back to the system, which increases the load on the production system